Primo When Dieting

What is this “magic effect” that people
alledge that primo has when dieting? I don’t
get it … what effect is so different from
any other gear while dieting? And if it really
exists, what is the mechanism of its action?
The idea that primo is so much better than
other gear when dieting seems to some people
to be more of an urban legend than reality.
Someone with primo/dieting experience please
explain the difference in effect; and some-
one with knowledge (Bill? Brock?) please take
a guess at the mechanism of action (if it
actually exists). Thanks.